The puzzle is based on the number 39 and the Zoll (inch).
- Zoll in german also translates as duties.
- the volume of the box is 1 Zoll^3
- the hight of the font used is 1 Zoll
- the numbers and signs have a gradient of 39%
- the numbers and signs have a minimal height of 0.39 cm
- all of the pieces fill 39% of the volume available

This version is produced by Roland Koch in a limited edition. It includes a signed stand.

There are two challenges: a relatively easy challenge is to pack the red pieces into the box and close the lid and - if you prefer a good challenge and don't need to rely on a puzzle solving software - pack all of the pieces into the box and close the lid.